It is hard to say anything definite about this because, as I said above, we have no plans to implement the EPUB import in Atlantis Word Processor yet.

Ideally, any file generated by a visual editor should not require manual tweaking. No one tweaks DOCXs (a DOCX file is also a ZIP package with mainly XML files). If we had a single major EPUB reader compliant with the EPUB specifications, such a "perfect visual EPUB editor" could have been created.